modifying your air box will help get the sound you want and you can use a normal filter. Modifying as in cutting out the normal inlet L pipe (so you'll have just the original rectangle box and a hole lol) and bonding in a larger diameter pipe... something like a flexi type pipe for example.
We used to have on the same diam pipe as the throttle body...seemed to make a difference but cant say how much or if it actually did